Washing Soda absorbs moisture because …
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The chemical formula for washing soda is Na2CO3 or sodium carbonate. It's a salt of carbonic acid, a chemical that produces a wide range of salts collectively known as carbonates. ... The washing soda binds to the minerals which make water hard and allows the detergent to be absorbed into fibers properly to clean clothes.
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Industrially, sodium bicarbonate is produced by reacting sodium carbonate with water and carbon dioxide. However, under normal household conditions sodium carbonate simply reacts with water or moisture in the air (it's hygroscopic) to form a hydrate - it doesn not form sodium bicarbonate. The water of hydration can be removed by mild heating (~100 C). At high temperatures (>850 C) sodium carbonate can decompose according to the following equation.
Na2CO3(s)⟶CO2(g)+Na2O(s)
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